Son Niranjan says the family plans to use some of its winnings to seek organ transplants for their grandparents, and to have his dad Mahendra's chronic heart problem addressed. They hope to use the rest of the money to pay off school loans.

"You know, we've worked so hard throughout our life. That's all my dad thinks about is winning the lottery. Hopefully our lives change now. It's pretty much an (American) dream come true," he added ? still in disbelief.

Two tickets sold in Florida and Maryland matched all six numbers. They'll split the $400 million jackpot -- the sixth largest lottery prize in U.S. history.